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Mosquito

Prospect in Alaska, United States with commodities Copper, Molybdenum, Silver, Lead, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10001745
MRDS ID A012529
Record type Site
Current site name Mosquito
Related records 10185826

Geographic coordinates

Geographic coordinates: -143.47271, 63.88972 (WGS84)
Relative position The Mosquito prospect is located within sections 3,4, 9, and 10, T. 24 N., R. 10 E., of the Copper River Meridian. It is location 1 of Singer and others (1976), and location 9 of Eberlein and others (1977). It is 6 miles south of the Mosquito Fork of the Fortymile River. The location is accurate to within 1/2 mile. The coordinates correspond to the approximate center of the prospect. The location is accurate to within 1/2 mile.

Site location context

Political divisions (FIPS codes)

Southeast Fairbanks(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tanacross D-5(quadrangle 1:63,360 scale)

Tanacross NW(quadrangle 1:100,000 scale)

Tanacross(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Molybdenum Primary
Silver Secondary
Lead Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Magnetite Ore
Molybdenite Ore
Pyrite Ore

Alteration

  • (Local) Zones of quartz-sericite-pyrite, quartz-magnetite, and epidote-chlorite-quartz pyrite alteration (Doyon Ltd., 1998).

Mineral occurrence model information

Model code 79
USGS model code 21a
Deposit model name Porphyry Cu-Mo
Mark3 model number 2

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Quartz Latite

Nearby scientific data

(1) Kgu
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Mosquito prospect consists of disseminated chalcopyrite, magnetite, molybdenite, and pyrite in an intrusion of hydrothermally altered quartz monzonite and quartz latite porphyry (Singer and others, 1976). The area contains small, isolated outcrops of felsic volcanic rocks that are reported to be more extensive than shown on Foster and others (1976) geologic map. The most common texture is porphyritic with a fine- to medium-grained groundmass. Phenocrysts include euhedral and subhedral quartz, some of which is mildly strained, and altered feldspar, biotite, and hornblende. The rocks range from slightly altered to so completely altered that the original texture and composition cannot be determined. Sericite, clay minerals, quartz, and chlorite are the most common alteration products. However, limonite and carbonate also occur (Foster and others, 1976). Potassium feldspars in a vein cutting the intrusion have an integrated 40Ar/39Ar age of 70.0 + / - 0.3 Ma (Newberry and others, 1996). The prospect has anomalous values in gold, bismuth, and tellurium, suggesting that it is an extension of the Carmacks porphyry belt (Alaska Division of Geological and Geophysical Surveys, 1993; Burleigh and Lear, 1994; Newberry and others, 1996). In 1974-75, some drilling and sampling took place on the prospect. Grades of up to 0.17% Mo were reported, but it is unclear if they refer to the Mosquito prospect or the Peternie prospect (TC022) (Singer and others, 1976).
  • Age = If this prospect represents a porphyry Cu-Mo deposit, the age of mineralization is likely the same or close to the age of alteration, reported by Newberry and others to be 70.0 +/- 0.3 Ma (1996).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Fortymile

Comments on the workings information

  • Workings / Exploration = In 1970-73, Resource Associates of Alaska did mapping, trenching, rock and soil sampling, and completed 3 miles of IP lines. In 1974-75, Cities Services did 788 feet of drilling in 2 holes, and 2.5 miles of IP lines. This was followed in 1979 by WGM Inc., who carried out petrographic analyses, mapping at 1:10,000 and 1:5,000 scales, a geochemical soil and rock sampling grid, and magnetics on the soil grid. In 1981 Arctic Resources Inc. analyzed 22 miles of soil traverses, and in 1984 Doyon Ltd. briefly visited the prospect. In 1990 Doyon Ltd. conducted rock, soil and stream sediment sampling for gold (Doyon Ltd., 1998).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Foster and others, 1976

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu-Mo deposit (Cox and Singer, 1986; model 21a)
Deposit Other Comments = This prospect lies within Doyon Ltd. selected lands. For more information, contact Doyon Ltd.

Reporter information

Type Date Name Affiliation Comment
Reporter 13-APR-99 Cameron, C.E. Alaska Division of Geological and Geophysical Surveys

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.